Data Sources for the 5th Edition of the Research.com Best Materials Science Scientists in South Africa Ranking
The 5th edition of the Best Materials Science Scientists in South Africa ranking was developed using comprehensive bibliometric data primarily sourced from OpenAlex and CrossRef, supplemented by multiple other reputable data repositories. These sources provide a broad and reliable spectrum of scholarly publication and citation information that underpins the ranking metrics. The bibliometric data used to calculate the citation-based metrics were collected on January 12, 2026, ensuring that the ranking reflects the most recent and authoritative information available at the time of compilation. A scientist’s position in this ranking is determined by their D-index (Discipline H-index), a metric that exclusively considers papers and citation impact within the examined discipline—Materials Science in this case—thereby offering a focused measure of expertise and influence in the field.
Scope of Research and Inclusion Criteria
The ranking process began with the examination of 279,971 scientist profiles identified from a diverse array of bibliometric data sources across all scientific disciplines. Specifically, 14 scientists specializing in Materials Science within South Africa were analyzed in detail. To qualify for inclusion in the ranking, a scientist's D-index had to meet a minimum threshold of 40. Additionally, the majority of a qualifying scientist’s tier publications needed to be within the domain of Materials Science, ensuring deep specialization in the field. Awards and distinguished achievements in Materials Science were also considered in validating candidates’ prominence.
The D-index threshold is calibrated dynamically based on the estimated total number of scholars per discipline, increasing in increments of 10 to maintain relevance across fields. This approach guarantees inclusion of the top 1% of leading scholars in each discipline. Furthermore, to ensure discipline-specific relevance, a scientist’s general H-index and D-index had to exhibit a proximity of 30% or less, reinforcing a strong correlation between overall impact and disciplinary focus.
Verification and Validation Practices
Recognizing that raw bibliometric data can never serve as an absolute evaluation tool for scholarly output, the research team took extensive manual verification steps for every scientist profile considered. Their work involved cross-correlating data against publications in a wide range of trustworthy and well-regarded scholarly sources. While the number of papers published in prominent journals and conference proceedings does not directly influence a researcher’s ranking position, it provides an important secondary signal reflecting the individual’s contribution to Materials Science research.
The ranking itself is established strictly by the D-index calculated using data from OpenAlex and CrossRef—the most prominent and widely recognized bibliometric databases accessible to the research community. This methodological rigor underpins the credibility and precision of the ranking. For detailed information on the data sources, criteria, and computational methods employed, please visit our methodology page.
Research.com’s Mission Behind the Ranking
At Research.com, our mission is to motivate researchers, companies, and policymakers worldwide to recognize emerging trends and directions within scientific disciplines by identifying leading experts. We aim to provide a transparent and accessible platform that allows the global scientific community to discover who the foremost authorities are in specific fields of study—whether at the national level, within countries such as South Africa, or across individual research institutions. Through this effort, we hope to facilitate collaborations, inform strategic decision-making, and foster scientific excellence by shining a light on researchers that drive innovation and knowledge advancement in Materials Science and beyond.
